Coolant (or water) boiling in the radiator's overflow tank as the engine runs or when you turn off the engine. TEST 3: Making Sure Both Fan Motor Relays Are Getting 12 Volts, TEST 4: Bypassing The Low Speed Fan Motor Relay, TEST 1: Testing The Amperage Draw Of The Low Speed Radiator Fan Motor, TEST 5: Bypassing The High Speed Fan Motor Relay, TEST 6: Making Sure The Radiator Fan Assembly Is Getting Power From The Low Speed Relay. Ford  |   If the radiator fan is not working, it’s a serious problem.. Just because the radiator fan is not on does not mean that it is not working. How to test Radiator Fan, Control Modle, or relay with VCDS Lite audi a4 / b6. To be a bit more specific: We're gonna' jumper female terminals 77 and 79 of the high speed radiator fan relay socket in the Power Distribution Center. GM  |   Misc Index  |   Nissan  |   Gently probe female terminal number 71 with the red multimeter test lead. Set th… Checking the operation of a fan relay on your vehicle is an easy procedure. In this section we're gonna' bypass the high speed radiator fan motor relay and see if the fan motors run. Save Share. Fuse 12 (40 A) of the Power Distribution Center. This material may not be reproduced without the author’s consent. The cooler/ radiator fan driver relay is located in the black box just behind your drivers side headlight assy under the hood. The radiator fan switch relay may not be supplying power to the fan. To be a little more specific: We're gonna' jumper terminal number 72 and terminal number 74 of the relay socket in the Power Distribution Center (under-hood fuse box). This lets you know that the high speed radiator fan motor has failed due to excessive wear and tear. The next step is to make sure that both radiator fan motor relays are getting power. Chrysler  |   Hot (+) only with Key On Engine Off (KOEO) or Key On Engine Running (KOER). Radiator fan relay by Bob O'Neill and Bob Lincoln Because the radiator fan requires a high level of current, a relay, managed by the logic module, turns the fan on and off. The under-hood fuse box is located towards the rear of the engine compartment. We use cookies to … Female terminal 74 should also have 10 to 12 Volts present with the key ON. The cooling fan relay is the relay that controls the engine’s cooling fans. CASE 2: Female terminal 71 DOES NOT have 10 to 12 Volts. VW  |   Suzuki  |   Repeat steps 3 through 5 on female terminal 74. Your purchase helps support my work in bringing you real diagnostic testing information to help you solve the problem on your vehicle. Your Radiator Fan Stopped Working - Here Are The Next Steps To … Locate the relay in immediate proximity to the fan being used. Jump to page: 08-04-2015, 01:09 PM. The most … The cooling fans on Chrysler cars are not particularly well-made, but that doesn't mean you can assume that they are broken the second the cooling system stops working. Easy step by step procedure to test an automotive relay, this information pertains to all relay controlled circuits. Ford  |   Printable View. This is usually caused by a bad radiator fan motor or fan motors drawing more than 40 Amps as they run. Jeep  |   Terms of Use Also, verify connectivity from the relay socket to the other connection on the fan … CASE 3: One fan motor ran but NOT both. Power provided by fuse #4 (7.5 Amp) of the left side dash fuse box (see image 4 of 4). Page 2 of 3 First 1 2 3 Last. Turn the key ON but don't start the engine. Fuse 23 (20 A) of the Power Distribution Center. CASE 2: The amperage draw is over 40 Amps. Reply. 2003 A4, AMB. These accessories can range from the main computer PCM (powertrian control module), radiator fan, fuel pump, door locks etc. You can follow the printed diagram on the cover to locate the relay you are in need of replacing. © 2011-2020 Abraham Torres-Arredondo In this test step we're gonna' apply battery power to the low speed circuit of the radiator fan motors by bypassing the low speed radiator fan relay with a jumper wire. This last test is optional and shows you how to bench test the fan motor relay. This test result generally lets you know that fuse 12 of the Power Distribution Center is blown. The logic module uses the temperature switch on the radiator for 1984 models; the radiator is turned on when the coolant temperature reaches 210 degrees and turned off when the coolant temperature cools to 180 degrees. A relay is switch that utilizes an electrical trigger signal to activate. This is the correct and expected test result. Connect the other end of the jumper to the terminal labeled with the number 74 (see illustration 2 of 2). This socket is on the Power Distribution Center (see image 3 of 3 above). If the car is already hot, should it be - Answered by a verified Jeep Mechanic. The quickest way to tell whether or not the electric fan(s) are working is to start the engine; let it reach normal operating temperature and then turn the A/C on. If it spins more than three full rotations, this indicates that it may be prone to slipping. Your next step is to go to: TEST 4: Bypassing The Low Speed Fan Motor Relay. Connect one end of the jumper wire to the terminal labeled with the number 72 (see illustration 2 of 2). Tools  |   Although this info applies to any 1998-2001 4 cylinder Honda Accord, the basic testing procedure (in each test step) can by applied to any Honda. Your temperature gauge will max out (as you're driving around). After confirming that the radiator fan relay is getting juice (TEST 1), the next step is to jumper circuits 1 and 2 with a jumper wire to see if the radiator fan motor comes on. This is the correct and expected test result. NOTE: Be careful when probing the female terminals of the relay socket with your multimeter test lead. Illustration 1 of 2 shows the location of the low speed radiator fan motor and illustration 2 of 2 will help you identify the female terminals we need to jumper together. Locate female terminals #72 and #74 of the relay socket (see illustration 2 of 2). On most Chrysler vehicles, the cooling fan relay must be engaged before power can go to … The cooling fan relay is normally located in either the underhood fuse and relay center or mounted to the electric fan assembly behind the radiator. I have a spare relay for test purposes . Disconnect the fan connector and make sure you have a good ground (the other connection goes to the relay). 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